Vanguard S&P 500 ETF is so important to have in a portfolio that it has always managed to grab the top two oe three on the list. VOO is a highly liquid fund with high daily trading volumes. Vanguard ETF is one of the reputable fund based on a major market index. Also in Australian stock exchange, Vanguard Australian Shares Index ETF(vas asx) seeks to track the return of the S&P/ASX 300 Index.Vanguard’s investment approach provides investors with an efficient way to capture long-term market performance.